Last



June 19, 1928. 1,674,621

w. A. KRENTLER litvevvar. W4.

Patented June 19, 19238.

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WALTER A. KRENTLER, OF DETROIT, MICIIIGAN, ASSIGNOR TO KRENTLER-AR-NGLD HINGE LAST COMPANY, OF DETROIT, MICHIGZLN, A COBPORATXON OF MICHIGAN.

LAST.

Application filed November 3, 1924. Serial No. 747,426.

My present invention is a novel and improved type of last with provision for connecting the forepart and heel part to permit relative movement. In my copending ap- 5 plication Ser. No. 745,364, filed Oct. 255,

192 i, 1 have described and illustrated a preferred form of last construction wherein a combined and cooperating pair of connecting members affords both a rigid and a yield- 10 ing action. In said companion application I have claimed this feature broadly, and in the present case illustrating a further embodiment of the invention, with certain features, advantages and improvements thereln, 15 I am claiming the particular construction herein illustrated. In my said copending case I utilize as the connecting pair of members two pairs of plates or links, each bearing upon the same pivot or pin, one in the 2 forepart and one in the heel part. In my present last, while I utilize two connecting members, one only of said members is a plate or link which is joined both to the forepart and the heel part. The cooperating and yielding member of spring metal is without slots, recesses or the like such as are necessary in utilizing links or plates, and furthermore the said spring member is attached only to one rivet or pin in. either heel part or forepart.

Referring to the drawings, illustrating a preferred embodiment of my invention,

Fig. 1 is a side view showing my last partly in cross-section;

Fig. 2 is a view illustrating the heel part and forepart partly collapsed; and

Fig. 3 is a fragmentary view, also partly in cross-section, illustrating the last parts in completely collapsed position;

Fig. 4 is a fragmentary longitudinal cross sectional. view; v

Fig. 5 is a plan view of the connecting plate or link; and

Fig. 6 is a view of the spring member. As shown in the drawings, the torepart 'l and heel part 2 of a wooden last are divided on well known lines of cut 3 and l, giving a circular bearing face 5 and abutting shoulders 6. Recesses or saw kerfs 7 in the .i torepart and 8 in the heel part are also formed to receive connecting members. These connecting members consist in the plate or link 10 and spring 12. The plate 10 is provided with a bored opening or re Iteto by the pivot p.

forepart. holding the member 10 firmly but pivotally in said -forepart. Opening from this recess 1% is also a longitudinally extending' slot 16 of appropriate diameter to receive the forward loop 17 of the spring member 12. The main connecting plate or link 10 is formed with a cam slot 24 to engage the pin 25 and a slot 19 to engage the pin 20 in the heel part. The feature of having the connecting plate or link 10 thus united by a pin 15 to the. torepart and through two pins 20 and to the heel part, which two latter pins operate through appropriate cam slots therefor, is most important. During the flexing of the last, either from collapsed. to lengthened position or the reverse action the plate 10 moves on the pin 15 as a pivot, whereas the heel part 2 and forepart -1 move, relatively on the pin 25 as a pivot. By having this plate or link 10 formed with a central cam slot 24, practically on the radius of movement from the pin 15, which in effect is straight across the link 10, the two last parts 1 and 2 are firmly and tightly united at all times. The heel part, however, owing to the increased 1everage and distance of the second pin 20 and cam slot 19, requires a different cam movement, due to the different movements of metal link and wooden parts of the last.

Thus the pins 15 and 20 are positioned below the axis of turning of the forepart and heel part when the last parts are in lengthened position and are above when in collapsed position. Therefore the plate 10 with the slots 24 and 19 permits the plate 10 to be firmly and constantly in engagement with the pins 20 and 25, the former being at all times traversing the cam path 19 during this flexing movement while the pin 25 traverses the cam path 24, thus keeping the last parts tightly engaged longitudinally against any separating action.

The spring member 12 is formed with one loop 17 for engagement with a slot 16 as already explained and with a further loop 27 near the other end to engage the pin 20 in the heel part. A tightening tension or yielding holding action is thus provided from the heel part and pin 20 to the torepart of the link 10 through the action of this spring member 12. The spring 12 the further function of cooperating with the en? the plate it t l till lid 7 and 8 and holdthe last parts against lat: eraldisplacement and torsional strains, While permitting the free movement of the tforepart and heel part relatively Witheach other. Thus my present construction provides a connecting member 10, Which is rigid in its longitudinal action upon the" forepart and heel part, and permits the free flexing oi the vlast owing to the form oi? the cam paths 24 and. 19. The cooperating 7 spring 12 serves to hold the last parts in tightly assembled position and to compensate i for Wear, While the entire construction is extremely simple in operation, economical and easy to install; both spring and plate can be assembled in the heel part and then the driving of the single forepart rivet .15

through the recess l l in the p1ate10serves to assemble the entire connecting members and the 'tivo last parts. The light spring v 12 preferably made of ire or the like, is

auxiliary only in its action,Vbu-t 'serves to automatically compensate for wear, to aid in filling up the recesses 7 .and S, and prevent sldewise displacement, and furthermore aids in completing the snapping of the heel part and forepart during the flexing action; once ,the-threepins 15, and 20 are disaligned,

asthe outer pins 15 and :20 pass the position of the center pin 25, then thespring will complete the collapsing or lengthening action within the limits allowed by the plate 10 and the cam paths 24c and 19, and the shoulder *6.

The action of the spring 12 also, in its tension between a portion of the plate 10 itself and the rear pin 20, hile aiding inasse1n- 'bling as above noted, enablesa' short and economical piece of spring metal to be utilized.

My invention is further described and defined in the form of claims as follows:

LA last having a forepart and a heel part relatively movable, a connecting link pivotally attached to and uniting said parts,

a spring member, said last having a recess to receive the spring member in combination With the l1nk,means on the link .to secure one end of the'spring and means on oneof the last parts to secure the other end of the spring, said spring and plate cooperating to fill the Width ofvthe said recess and prevent lateral displacement of the last parts.

2. A metal union .for connecting the heel In testimony whereof, Ihave signedmyname to this specification.

W LTER A. KR NTLER, 

